@@ -754,6 +754,15 @@ def axhline(self, y=0, xmin=0, xmax=1, **kwargs):
754754 Returns
755755 -------
756756 `~matplotlib.lines.Line2D`
757+ A `.Line2D` specified via two points ``(xmin, y)``, ``(xmax, y)``.
758+ Its transform is set such that *x* is in
759+ :ref:`axes coordinates <coordinate-systems>` and *y* is in
760+ :ref:`data coordinates <coordinate-systems>`.
761+
762+ This is still a generic line and the horizontal character is only
763+ realized through using identical *y* values for both points. Thus,
764+ if you want to change the *y* value later, you have to provide two
765+ values ``line.set_ydata([3, 3])``.
757766
758767 Other Parameters
759768 ----------------
@@ -828,6 +837,15 @@ def axvline(self, x=0, ymin=0, ymax=1, **kwargs):
828837 Returns
829838 -------
830839 `~matplotlib.lines.Line2D`
840+ A `.Line2D` specified via two points ``(x, ymin)``, ``(x, ymax)``.
841+ Its transform is set such that *x* is in
842+ :ref:`data coordinates <coordinate-systems>` and *y* is in
843+ :ref:`axes coordinates <coordinate-systems>`.
844+
845+ This is still a generic line and the vertical character is only
846+ realized through using identical *x* values for both points. Thus,
847+ if you want to change the *x* value later, you have to provide two
848+ values ``line.set_xdata([3, 3])``.
831849
832850 Other Parameters
833851 ----------------
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